气相爆轰数值分析及碳与碳包铁纳米材料合成

Numerical Analysis of Gaseous Detonation and Preparation of Carbon and Carbon Coated Iron Nano Materials

从理论上分析了气相爆轰反应中爆轰产物组分与形成稳定爆轰的条件。通过以氧气与苯、氧气与溶有二茂铁的苯为原料,用气相爆轰形式制备了碳纳米材料与碳包铁纳米颗粒。爆炸产物经XRD与TEM表征发现,碳纳米材料呈球或准球状,颗粒尺寸在10~30 nm,分散性较差。团簇区主要以无定型碳为主,分散区有少量洋葱状富勒烯。游离态碳与铁物质的量比对碳包铁的形貌结构有影响,其比值在10~28时,碳包铁纳米颗粒呈球状,核/壳结构明显,分散性较好;大于50时,其形貌结构发生变化,部分碳以片状结构存在。

The condition of steady gaseous detonation and detonation product composition were analyzed theoretically. Nano carbon material and carbon coated iron nanoparticles were prepared by a gaseous detonation method with oxygen and benzene, oxygen and benzene dissolved ferrocene, respectively. Explosion products were characterized by X-ray diffraction and transmission electron microscope. Results show that carbon nano materials are spherical or quasi-spherical, the particle size range is 10～30 nm, and dispersity is poor. The cluster area is mainly amorphous carbon, while a few onion-like fullerenes exist in dispersing region. The molar ratio of free carbon and iron has an influence on morphology and structure of carbon coated iron nanoparticles. When the molar ratio value range is 10～28, carbon coated iron nanoparticles can be prepared, which are spherical, with a clear core-shell structure and good dispersion; when the value is greater than 50, carbon coated iron morphology changes and part of carbon possesses a sheet structure.